As far as i know they dont, your bandwith allowance is (or should be) taken via your modems mac address. So rendom broadcasts should not get counted in your limit.
Just out of interest where are you seeing these packets???
I get quite a few logs on my firewall but 20 - 200 packets a sec seems mighty excessive.
Are the packets all comin from the same place etc?
PS: not sure if anyones said it, but welcome to Cable Forum
